linux-kernel - Re: [PATCH 2/6] ide: move SFF I/O code to ide-io-sff.c

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Date:	Mon, 19 Jan 2009 22:04:37 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] ide: move SFF I/O code to ide-io-sff.c

Alan Cox wrote:

>>    Tried looking at how in*()/out*() are defined on x86?

> Tried looking at how ide_mm_inb is defined on x86

    That's a bogus argument because:
- MMIO isn't much used by the IDE drivers much (normally the inline
   ins*()/outs*() accessors are used;
- that's used only by generic IDE code, not by the drivers about which
   I'veargued;

I've already agreed that the generic code would probably win from using 
ioread*()/iowrite*().

>>>It's already making function calls, without the benefit of inlining and

>>    I'm afraid you're wrong here.

> I'm afraid you are the one who is wrong. The IDE layer is duplicating a
> generic level of indirection with its own code - purely because IDE
> pre-dates that core functionality. The whole IDE layer indirection can go
> away because Linux has caught up with the needs of the IDE layer.

    What IDE indirection you're talking about anyway?

> Alan

MBR, Sergei
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